Slithering Abomination

Emerge {6}{b}{b} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's converted mana cost)
When you cast Slithering Abomination, distribute X -1/-1 counters among any number of target creatures, where X is the number of creature cards in your graveyard.
Its maw devours the flesh. Its gaze devours the mind.